Electroscope Metal Case

More sensitive instrument as leaf deﬂection is unaffected by aircurrents or by charges residing on the case. Reacts only to chargeswhich are intentionally brought near or put on them.Comprised of a box made ofaluminium with two transparentglass windows to shut out aircurrents and a plated metal supportrod entering from the top through apolyethylene insulator. Two leavesof thin aluminium foil are suspendedfrom the support rod. Supplied withthree pairs of aluminium leaves.